When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I know there are some companies that make silencers for their mufflers/tips, you could try to find one of these. If not all you can do (that I know of) is try to find a different muffler.
tennis ball in the muffler tip? with a much smaller hole in it. idk man, stuff it with steel wool, that would silence it for sure, i wouldnt run it like that long :-p